Connecting a few of the dots here, would it not be the best idea to have weighbridges for aircraft in taxiways in order to (a) give the takeoff weight to the captain for thrust settings (b) charge the airline a tariff for TOW, and (c) give a checksum for any irregularities between the expected and actual weights that could point to something awry (such as ice on the wings?
The technology has been around for decades. I tried to sell it to airports during the late 1990s. But it's always down to 'who is going to pay for it?' - the added safety aspect of avoiding wrong take-off calculations never seemed to matter.